GM Service Manual Online
For 1990-2009 cars only
  1. Remove the oil pan drain plug. Allow the oil to drain.
  2. Remove the oil filter.
  3. Remove the engine block coolant drain plugs. Allow the coolant to drain.
  4. Install the engine block coolant drain plugs.
  5. Tighten
    Tighten the engine block coolant drain plugs to 20 N·m (15 lb ft).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Install the oil pan drain plug.
  7. Tighten
    Tighten the oil pan drain plug to 25 N·m (18 lb ft).